Xerox 2135DT Service Guide - Page 68
Color misalignments
UPC - 042215474696
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Color misalignments 1. Test the registration sensor as described in the topic "Switch scan test" on page 63. Ensure the registration sensors are clean without toner dust on them. Also test the registration solenoid, as described in the topic "Motor and clutch tests" on page 69, to ensure the registration shutter operates smoothly and closes complely, allowing no toner to fall on the senors. 2. Look for any broken gears in the printer. specifically, inspect the imaging drum gear assembly, the paper feeder assembly and the transfer belt assembly. 3. Inspect and clean the imaging drum unit's power terminals Ensure the spring-loaded pins travel smoothly up and down. 4. Replace any imaging drum units you suspect are defective. 5. Are the LED heads' ribbon cables undamaged and properly seated? Replace any suspect LED head assembly, if necessary 6. Inspect the wiring harnesses of the junction board for damage or improper seating. 7. Inspect the wiring harnesses of the engine controller board for damage or improper seating. 8. Replace the engine controller board. Transfer the old engine controller board's EEPROM (lower-right corner of board) to the new engine controller board. Service Guide 55